摘要
为合理计算大型浅仓贮料的侧压力,该文基于统一强度理论,采用静力平衡分析法,综合考虑了中间主应力、仓壁与贮料间的摩擦力以及由于锥堆产生的超压等影响,推导出大型浅仓侧压力计算公式,并与试验实测、Rankine公式和Coulomb公式进行了对比验证,探讨了统一强度理论参数、内摩擦角和贮料与仓壁间摩擦系数等影响特性。结果表明:该文计算值与试验实测值吻合较好,且计算简练;锥堆时Coulomb公式结果偏大,Rankine公式结果偏小,平堆时Coulomb公式和Rankine公式的结果均偏保守;统一强度理论参数、内摩擦角对侧压力的影响显著,贮料与仓壁间摩擦系数的影响较小。
In order to reasonably compute the lateral pressure of a bulk-solid, the formula for the lateral pressure acting on the wall of a large squat silo was established based on the unified strength theory and the static equilibrium method, which considered the integrated effects of the friction between a silo and its granular material, the intermediate principal stress and overpressure caused by the conical pile top. The pressures predicted by Rankine formula, Coulomb formula and the solution obtained in this paper were compared with the available test results from published literatures. A parametric study is undertaken to investigate the influence of the unified strength theory parameter, internal friction angle and friction coefficient. The computational results by the proposed solution coincide quite well with test results. For the conical pile top of the stored bulk material, the pressures predicted by Coulomb formula are larger than the actual values, while those by Rankine formula are smaller. For the horizontal plane top, the pressures predicted by Rankine and Coulomb formulae are both in conservation. The effects of the unified strength theory parameter and internal friction angle are obvious, while the friction-coefficient effect is less significant.
出处
《工程力学》
EI
CSCD
北大核心
2013年第5期244-249,共6页
Engineering Mechanics
基金
国家自然科学青年基金项目(41202191)
中国博士后科学基金面上项目(2012M520079)
中央高校基本科研业务费专项资金项目(CHD2011ZY012)
高等学校博士学科点专项科研基金项目(20110205130001)
陕西省自然科学基金项目(2011JM7002)
关键词
浅圆仓
统一强度理论
侧压力
静力平衡
中间主应力
squat silos
unified strength theory
lateral pressure
static equilibrium
intermediate principal stress
